// Copyright (c) 2020 PaddlePaddle Authors. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

#pragma once

#include <chrono>
#include <iomanip>
#include <iostream>
#include <ostream>
#include <stdlib.h>
#include <vector>

#include <algorithm>
#include <cstring>
#include <fstream>
#include <numeric>

#include "opencv2/core.hpp"
#include "opencv2/imgcodecs.hpp"
#include "opencv2/imgproc.hpp"

namespace PaddleOCR
{

    struct OCRPredictResult
    {
        std::vector<std::vector<int>> box;
        std::string text;
        float score = -1.0;
        float cls_score;
        int cls_label = -1;
    };

    struct StructurePredictResult
    {
        std::vector<float> box;
        std::vector<std::vector<int>> cell_box;
        std::string type;
        std::vector<OCRPredictResult> text_res;
        std::string html;
        float html_score = -1;
        float confidence;
    };

    class Utility
    {
    public:
        static std::vector<std::string> ReadDict(const std::string &path);

        static void VisualizeBboxes(const cv::Mat &srcimg,
                                    const std::vector<OCRPredictResult> &ocr_result,
                                    const std::string &save_path);

        static void VisualizeBboxes(const cv::Mat &srcimg,
                                    const StructurePredictResult &structure_result,
                                    const std::string &save_path);

        template <class ForwardIterator>
        inline static size_t argmax(ForwardIterator first, ForwardIterator last)
        {
            return std::distance(first, std::max_element(first, last));
        }

        static void GetAllFiles(const char *dir_name,
                                std::vector<std::string> &all_inputs);

        static cv::Mat GetRotateCropImage(const cv::Mat &srcimage,
                                          std::vector<std::vector<int>> box);

        static std::vector<int> argsort(const std::vector<float> &array);

        static std::string basename(const std::string &filename);

        static bool PathExists(const std::string &path);

        static void CreateDir(const std::string &path);

        static void print_result(const std::vector<OCRPredictResult> &ocr_result);

        static cv::Mat crop_image(cv::Mat &img, const std::vector<int> &area);
        static cv::Mat crop_image(cv::Mat &img, const std::vector<float> &area);

        static void sorted_boxes(std::vector<OCRPredictResult> &ocr_result);

        static std::vector<int> xyxyxyxy2xyxy(std::vector<std::vector<int>> &box);
        static std::vector<int> xyxyxyxy2xyxy(std::vector<int> &box);

        static float fast_exp(float x);
        static std::vector<float>
        activation_function_softmax(std::vector<float> &src);
        static float iou(std::vector<int> &box1, std::vector<int> &box2);
        static float iou(std::vector<float> &box1, std::vector<float> &box2);

    private:
        static bool comparison_box(const OCRPredictResult &result1,
                                   const OCRPredictResult &result2)
        {
            if (result1.box[0][1] < result2.box[0][1])
            {
                return true;
            }
            else if (result1.box[0][1] == result2.box[0][1])
            {
                return result1.box[0][0] < result2.box[0][0];
            }
            else
            {
                return false;
            }
        }
    };

} // namespace PaddleOCR